20100122011 has 4 divisors (see below), whose sum is σ = 20188669032. Its totient is φ = 20011574992.

The previous prime is 20100121997. The next prime is 20100122051. The reversal of 20100122011 is 11022100102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20100122011 - 2⁷ = 20100121883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20100122051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44273170 + ... + 44273623.

It is an arithmetic number, because the mean of its divisors is an integer number (5047167258).

Almost surely, 2^20100122011 is an apocalyptic number.

20100122011 is a deficient number, since it is larger than the sum of its proper divisors (88547021).

20100122011 is an equidigital number, since it uses as much as digits as its factorization.

20100122011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88547020.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 20100122011 its reverse (11022100102), we get a palindrome (31122222113).

The spelling of 20100122011 in words is "twenty billion, one hundred million, one hundred twenty-two thousand, eleven".